A telescopic supporting device is provided, which includes a plurality of hollow kits and a plurality of stoppers. Each of the plurality of hollow kits has the same outline but different size. The plurality of first grooves are provided on the outer wall. The plurality of second grooves are provided on the inner wall. Each of the plurality of first grooves and each of the plurality of second grooves are adjacent to each other and are alternatively configured on each of the plurality of hollow kits. Each of the plurality of first grooves of each of the plurality of hollow kits of inner side is correspondingly combined with each adjacent one of the plurality of second grooves of each of the plurality of hollow kits of outer side to form a plurality of stopper containing parts.